package com.youi.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * @description: 定时任务线程池
 * 默认情况下，在创建了线程池后，线程池中的线程数为0，当有任务来之后，就会创建一个线程去执行任务，
 * 当线程池中的线程数目达到corePoolSize后，就会把到达的任务放到缓存队列当中；
 * 当队列满了，就继续创建线程，当线程数量大于等于maxPoolSize后，开始使用拒绝策略拒绝
 * @Author: winty
 * @Date: 2020/5/27 11:00
 */
@Configuration
@EnableAsync
public class ThreadPoolTaskConfig {
    /**
     * 核心线程数（默认线程数）
     */
    private static final int CORE_POOL_SIZE = 20;
    /**
     * 最大线程数
     */
    private static final int MAX_POOL_SIZE = 30;
    /**
     * 允许线程空闲时间（单位：默认为秒）
     */
    private static final int KEEP_ALIVE_TIME = 10;
    /**
     * 缓冲队列大小
     */
    private static final int QUEUE_CAPACITY = 200;
    /**
     * 线程池名前缀
     */
    private static final String threadNamePrefix = "Async-Service-";

    @Bean
    public Executor getTaskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setThreadNamePrefix("task-schedule2-");
        executor.setMaxPoolSize(MAX_POOL_SIZE);
        executor.setCorePoolSize(CORE_POOL_SIZE);
        executor.setKeepAliveSeconds(KEEP_ALIVE_TIME);
        executor.setQueueCapacity(QUEUE_CAPACITY);
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return executor;
    }
}
